Stop motion for yarn winding machine



Dec. 2, 1969 J. B. CHAVIS 3,481,550

v STOP MOTION FOR YARN WINDING MACHINE Filed Sept. 6. 196'? s Sheets-Shet 1 l kq INVEN'I'OR Julian B. Chuvis ATTORNEY Dec. 2, 1969 J. a. CHAVIS 3,481,550

STOP MOTION FOR YARN WINDING MACHINE Filed Sept. 6, 1967 3 Sheets-Sheet 2 n v o B 0 s. N (D) no N m &

INVENTOR Julian B. Chovis ATTORNEY I) 2, 1969 J. B. CHAVIS 3,481,550

STOP MOTION FOR YARN WINDING MACHINE Filed Sept. 6. 196'? 3 Sheets-Sheet 3 FIG.3.

INVENTOR Julian B. Chovis ATTORNEY United States Patent 3,481,550 STOP MOTION FOR YARN WINDING MACHINE Julian B. Chavis, P.O. Box 939, Gastonia, N.C. 28052 Filed Sept. 6, 1967, Ser. No. 665,799 Int. Cl. B65h 63/02 US. Cl. 242-37 4 Claims ABSTRACT OF THE DISCLOSURE This invention relates to a stop motion for a yarn winding machine of the type having a plurality of winding stations at each of which a yarn package being wound is supported on a pivoted yoke for frictional driving engagement with a driving drum, said yoke being swingable into anon-winding position by means of a rack bar which is operated by a normally latched, spring-biased means which is unlatched by yarn detector means upon yarn failure. The stop motion comprises a three-armed cradle rockably mounted on the machine frame, one arm being operatively connected with the rack bar, a second arm being connected by a tension spring to the frame, and a third arm having a pin at its outer end engageable with the lower end of a normally vertical latch lever pivoted on the frame and the upper end of which carries an armature for engagement with a normally energized electromagnet whereby the latch holds the spring tensioned. There is a pivoted yarn detector having a switch which, upon yarn failure, opens the circuit to the electromagnet allowing the armature to fall away and release the latch, whereupon the spring rocks the cradle thereby moving the rack bar to raise the yoke to non-winding position.

This invention relates to a stop motion for a yarn winding machine, and, more particularly, to a stop motion for a Foster type 102 winding machine.

Machines of this type, known as quick traverse winders, are used for winding rather large cone-shaped packages of yarn wherein a yarn traverse is used to lay the yarn in the well-known cross wind or Fiji wind. In the type of machine identified as the Foster Machine, the yarn traverse is by means of a pair of oppositely directed intersecting grooves helically formed on the surface of a drum, which drum also frictionally drives the yarn package for winding the yarn.

In machines of this general type, there is usually a plurality of packages being wound, and it is desirable to stop the operation of winding of a single package when the supply of yarn to that package is interrupted, either by exhaust or by rupture. Such devices, often called knockoffs, stop the operation of a single winding spindle by removing the package from frictional contact with the winding and traverse drum or cam upon the absence of a yarn supply. A detector engages the yarn in its passage from a source to the winding package to permit normal operation of the machine. Upon exhaust or rupture of the traveling yarn, the detector moves to cause operation of the stop device or knock-off device.

Accordingly, the primary object of this invention is the provision of an electromagnetically controlled means to interrupt the winding operation on a Foster type 102 winder upon absence of suflicient tension on a thread or yarn passing to the winding package. g

Another object of this invention is the provision of an electromagnetically controlled means for releasing a spring operated knock-off device for a winding machine of the class described.

Other objects and advantages will become apparent from the following description taken in conjunction with the accompanying drawings, in which:

3,481,550 Patented Dec. 2, 1969 FIG. 1 is an end elevation, with certain parts omitted, of the machine in operative position;

FIG. 2 is a similar end elevation showing the result of yarn failure, and

FIG. 3 is a partial front elevation with parts omitted.

Referring now to FIG. 1, numeral 10 indicates a winding machine of the well known Foster type. A winding drum 11 mounted on frame 12 is driven in any suitable well known manner. A winding core 13 is rotatably supported on an arm 14 of a yoke 15 as is well known in the art. The winding or yarn package 16 is built up on the core 13 by frictional contact with the drum 11. The drum 11 is provided with a groove 17, shown in FIG. 3, and which is composed of intersecting continuous oppositely directed spirals 18 and 19.

Yoke 15 is pivotally mounted on the machine at 43 and has an arm 42 which is pivotally connected at 41 to one end of a rack bar 40 provided with teeth 39 at its opposite end. Movement of the rack bar to the left (FIG. 1) will raise yoke 15 to the non-Winding position of FIG. 2.

A three-armed cradle 33 is rockably mounted on frame 12 by means of stub shafts 34, 34'. Arm 37 at its lower end has a dog 38 normally engaged with teeth 39 of rack bar 40, and arm 36 is connected at its outer end to frame 12 by a tension spring 35 which, when tensioned, biases cradle 33 in a clockwise direction (FIG. 1) to move yoke 15 to non-winding position through rack bar 40 and arm 42. (Additional biasing means may be used with rack bar 40 and arm 42 if deemed necessary.) Arm 32 has a pin 31 at its outer end which is received in a recess 31 in the lower end of a latch lever 30 which is pivoted to frame 12 at 30. The upper end of latch lever 30 carries an L-shaped arm 29 which depends from an armature 28. An electromagnet 26 is housed in casing 27 on frame 12 and is normally energized by a circuit including conductor wires 24, 25, a yarn-controlled switch (not shown) and a suitable source of electricity (not shown). When electromagnet 26 is energized, armature 28 is engaged therewith and latch lever 30 holds cradle 33 in the position of FIG. 1 with spring 35 tensioned and yoke 15 in the winding position.

The yarn y being wound on the core 13 passes, in this instance, upwardly from a source of supply, not shown, over a pivotally mounted detector 20 which is slightly biased to permit it to move clockwise (FIG. 1) in the event of yarn failure. Movement of the detector 20 actuates an electric switch (not shown) contained in the small housing 21 on which the detector is mounted, said housing being piovted at 22 on a frame member 23.

In operation during normal winding the parts are as shown in FIG. 1. In the event of yarn failure (and the expression yarn failure as used herein is intended to mean any condition which fails to hold the yarn detector in normal position with the swtich closed, such as slackness, breakage or exhaustion) detector 20 will move clockwise about pivot 22 and the switch in housing 21 will be actuated to open the circuit to the electromagnet, whereupon armature 28 will drop, releasing latch lever 30' and allowing spring 35 to rock cradle 33 and raise yoke 15 to the non-winding position of FIG. 2.

Although only one embodiment of the invention has been depicted and described, it will be apparent that this embodiment is illustrative in nature and that a number of modifications in the apparatus and variations in its end use may be effected without departing from the spirit or scope of the invention.

What is claimed is:

1. In a yarn winder of the type having a plurality of winding stations any of which is rendered inoperative upon yarn failure, a frame, each station having a driving drum carried by said frame, a pivoted yoke, a rotatable core carried by said yoke for driving engagement with 3 said drum whereby a yarn package is wounded on sai core, and a rack'bar operatively connected to said yoke for moving said yoke to a non-winding position in the event of yarn failure; a stop motion which comprises:

(a) rack bar actuating means rockably mounted on said frame and operatively connected to said rack bar, spring means connected to said actuating means and said frame for biasing said actuating means to move said yoke to non-winding position, and latch engaging means on said actuating means;

(b) latch means comprising a normally energized electromagnet on said frame, an armature movably mounted on said frame and having means connected therewith for cooperation with said latch engaging means to hold said actuating means against the bias of said spring means as long as said electromagnet is energized, said armature being free to move to latch releasing position upon de-energization of said electromagnet to allow said spring means to effect the movement of said yoke to non-winding position; and

(c) yarn detector means operatively connected with said electromagnet to de-energize the same in the event of yarn failure.

2. The structure of claim 1 in which the rack bar actuating means comprises a three-armed cradle in which one arm is operatively connected to the rack bar, a second arm is connected to said spring means, and the third arm carries said latch engaging means.

3. The structure of claim 1 in which the means for movably mounting said armature comprises a latch lever pivoted on said frame, one end of said lever being connected to said armature and the other end having a portion for cooperation with said latch engaging means.

4. The structure of claim 1 in which:

(a) the rack bar actuating means comprises a threearmed cradle, one arm being operatively connected at its outer end to said rack bar, a second arm having its outer end connected to said frame by spring means in the form of a tension spring, and the third arm having a pin at its outer end which comprises the latch engaging means;

(b) the latch means includes a normally vertical latch lever pivoted on said frame, said armature being mounted on the upper end of said lever, the lower end of said lever being recessed to receive said pin whereby said cradle is latched with said spring under tension when said electromagnet is energized; and

(c) the yarn detector means is pivotally mounted on a frame member and is biased to move to a position to effect de-energization of said electromagnet in the event of yarn failure.

References Cited UNITED STATES PATENTS 1,895,244 1/1933 Meyer-Gaus et al. 242-36 1,958,060 5/1934 McKean 242-37 2,367,768 1/ 1945 Gibbs et al 242-37 3,282,517 11/1966 Chavis 242-37 STANLEY N. GILREATH, Primary Examiner 

